Andrei Pimenov

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Classical terahertz magneto-spectroscopy of conducting systems is dominated by cyclotron resonance. Here not only information about the charge carriers but also key insights into the band structure of various two-dimensional systems can be extracted.
Quantum corrections to the optical spectra manifest themselves in several forms. For instance, optical analogs of microwave-induced resistance oscillations can be observed or dynamic equivalent of Shubnikov-de Haas oscillations emerges.
In strong magnetic fields, quantum effects dominate the optical response, leading to phenomena such as quantized Faraday rotation. This effect is especially pronounced in magnetically-doped two-dimensional topological insulators, where experiments directly reveal the quantum of the rotation angle equal to the fine structure constant, α ≈ 1/137. This dimensionless physical constant provides a profound connection between solid-state physics, cosmology, and mathematics, highlighting its universal significance.

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Uni Vienna
PH2
Contact: Paul Van Loosdrecht / Matteo